Replace @reach/portal with custom Portal

app/soapbox/components/autosuggest-input.tsx

@@ -1,4 +1,3 @@
-import { Portal } from '@reach/portal';
 import clsx from 'clsx';
 import { List as ImmutableList } from 'immutable';
 import React from 'react';
@@ -6,7 +5,7 @@ import ImmutablePureComponent from 'react-immutable-pure-component';
 
 import AutosuggestEmoji, { Emoji } from 'soapbox/components/autosuggest-emoji';
 import Icon from 'soapbox/components/icon';
-import { Input } from 'soapbox/components/ui';
+import { Input, Portal } from 'soapbox/components/ui';
 import AutosuggestAccount from 'soapbox/features/compose/components/autosuggest-account';
 import { isRtl } from 'soapbox/rtl';
 import { textAtCursorMatchesToken } from 'soapbox/utils/suggestions';

app/soapbox/components/autosuggest-textarea.tsx

@@ -1,9 +1,9 @@
-import { Portal } from '@reach/portal';
 import clsx from 'clsx';
 import React from 'react';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import Textarea from 'react-textarea-autosize';
 
+import { Portal } from 'soapbox/components/ui';
 import { textAtCursorMatchesToken } from 'soapbox/utils/suggestions';
 
 import AutosuggestAccount from '../features/compose/components/autosuggest-account';

app/soapbox/components/ui/tooltip/tooltip.tsx

@@ -1,7 +1,8 @@
-import { Portal } from '@reach/portal';
 import { TooltipPopup, useTooltip } from '@reach/tooltip';
 import React from 'react';
 
+import Portal from '../portal/portal';
+
 import './tooltip.css';
 
 interface ITooltip {

package.json

@@ -57,7 +57,6 @@
     "@reach/combobox": "^0.18.0",
     "@reach/menu-button": "^0.18.0",
     "@reach/popover": "^0.18.0",
-    "@reach/portal": "^0.18.0",
     "@reach/rect": "^0.18.0",
     "@reach/tabs": "^0.18.0",
     "@reach/tooltip": "^0.18.0",

yarn.lock

@@ -2714,7 +2714,7 @@
     "@reach/utils" "0.18.0"
     tabbable "^5.3.3"
 
-"@reach/portal@0.18.0", "@reach/portal@^0.18.0":
+"@reach/portal@0.18.0":
   version "0.18.0"
   resolved "https://registry.yarnpkg.com/@reach/portal/-/portal-0.18.0.tgz#dd466f5110689d14a0e7491b3aa8a449e8cefb40"
   integrity sha512-TImozRapd576ofRk30Le2L3lRTFXF1p47B182wnp5eMTdZa74JX138BtNGEPJFOyrMaVmguVF8SSwZ6a0fon1Q==